Hello anindame;
Happy to be of help!
How do you get a 40+?
That's actually a very complex question.
Accuracy on a drill only tells you part of the story: remember that the GMAT is a computer adaptive test; accuracy ratings from a practice drill
doesn't really tell you much about how your score will pan out on the test.
What you need to do is take full length tests. Take the ENTIRE test - don't skip the AWA and the IR.
Once you've done the test; do a complete evaluation of your response.
Keep track of the questions you guess (even if you got them right)
Look for patterns - You might be weak in Subject verb agreement or with Bold Faced questions;
or you might be unable to finish the sections in time.
Once you've identified patters - go ahead and work towards resolving them.
That's the best advice I could give you right now!
To reiterate:
Full length tests ->maintain an
error log -> look for patters -> improve!
Hope that helps!
and good luck on the GMAT
Cheers;
Peo